How many Pico Toning sessions are recommended?

The freckles and blemishes on my face have gotten much darker, and my overall skin tone seems dull, so I want to get Pico Toning treatment.

Since this is my very first time getting Pico Toning, I have many questions regarding the recommended number of sessions and the duration of the results. I am writing this post to ask for advice from those who have already received the treatment.
First of all, I would like to know the recommended number of sessions and frequency for Pico Toning. I looked it up and found that you usually need to receive it consistently at intervals of 1 to 2 weeks for at least 10 sessions to see noticeable improvement in pigmentation.
I am curious if it is really difficult to feel melasma or blemishes fading with only about 5 short-term treatments, and on average, how many treatments you received to actually feel your skin tone becoming clearer.
I would also like to know if the treatment effectiveness drops significantly if I miss a cycle due to being busy.
And the part I am most concerned about is the duration of the effects after the procedure.